Symmetra MegaWatt may lose Modbus communications with DCE after upgrading to StruxureWare 7.5

Product Line:

StruxureWare Data Center Expert
Symmetra MegaWatt

Environment:

Upgrade to StruxureWare DCE 7.5
Symmetra MW monitored via Modbus

Cause:

Due to the upgrade of StruxureWare DCE, the modbus DDF for the Symmetra MW is also updated to version 12. If the Symmetra is running older firmware, some registers may report off-line and StruxureWare may report this as the server being off-line. The same issue may occur in an older DCE revision if you update the DDF to the most recent version. Older firmware should be fine with version 11 of the DDF.

Resolution:

If you have upgraded to DCE 7.5 and see this issue, please look into updating the Symmetra MW firmware. The table below shows the affected firmware revisions when used with the new DDF. If you can not update the Symmetra and have already updated DCE or need to do so, please contact tech support and if allowed to remotely access the DCE server, can remove and replace the DDF causing the issue. This should not affect the EBS, only the UPS.